21542152503 has 4 divisors (see below), whose sum is σ = 28722870008. Its totient is φ = 14361435000.

The previous prime is 21542152487. The next prime is 21542152547. The reversal of 21542152503 is 30525124512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21542152503 - 2⁴ = 21542152487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542152573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3590358748 + ... + 3590358753.

It is an arithmetic number, because the mean of its divisors is an integer number (7180717502).

Almost surely, 2^21542152503 is an apocalyptic number.

21542152503 is a deficient number, since it is larger than the sum of its proper divisors (7180717505).

21542152503 is an equidigital number, since it uses as much as digits as its factorization.

21542152503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7180717504.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21542152503 in words is "twenty-one billion, five hundred forty-two million, one hundred fifty-two thousand, five hundred three".